[detruncate]

If you're already auto-importing and it's not working, try clicking the "My PC does not update the time stamp on my hand history files." box. It's on the auto-import window.

I find that auto-importing as often as every 2 minutes works well for 4 tables if you move your HH files to an archive folder or delete them before each session, and disable the import of observed hands while you're playing -- the .hhf files are stored until you close party/empire/whatever, so you just have to make sure to re-enable this feature and import once more before you shut things down for the day if you're concerned about missing observed hands. PT shouldn't start tripping over itself even on a long 4-table session on a fairly old PC (I'm running a 1 gig).